2022-2024 Alfa Romeo Stelvio FCW/ACC Warning Lamps TSB

Owners of 2022-2024 Alfa Romeo Stelvio vehicles may observe that the Forward Collision Warning (FCW) or Adaptive Cruise Control (ACC) warning lamps illuminate on the Instrument Panel Cluster (IPC). This issue, detailed in manufacturer communication S2408000056 Rev. A, indicates a temporary unavailability of these safety systems.

This communication, released in December 2024, helps technicians understand the conditions that lead to these warnings and associated diagnostic trouble codes (DTCs). The Alfa Romeo Stelvio FCW ACC warning is often a temporary condition influenced by various environmental and vehicle-specific factors.

Symptoms

Drivers will notice the "Forward Collision Warning (FCW), or Adaptive Cruise Control (ACC) Warning Lamps Illuminate On The Instrument Panel Cluster (IPC)" message. This indicates that the systems are temporarily unavailable.

Diagnostic Trouble Codes (DTCs)

When the Alfa Romeo Stelvio FCW ACC warning appears, technicians may find specific Diagnostic Trouble Codes (DTCs) stored or active in the Adaptive Cruise Control (ACC) module. These codes point to issues with the radar sensor:

Conditions Causing Temporary Deactivation

The temporary deactivation of the FCW and ACC systems, leading to the warning lamps and DTCs, can be triggered by several conditions where the radar sensor cannot accurately detect obstacles. These include:

• Uneven Weight Distribution: A change in how the vehicle's weight is distributed.
• Vehicle Geometry Changes: Alterations in the vehicle's physical geometry.
• Limited Radar References: Driving on roads with few radar-reflective objects, such as guard rails, road signs, or other vehicles.
• Severe Weather: Conditions like heavy snowfall or rain can impair sensor performance.
• Highly Reflective Environments: Driving through tunnels with reflective tiles, or areas with ice, snow, or road work, as well as situations with blinding angles of the sun.
• Physical Obstructions: The presence of mud, dirt, or ice on the bumper or the radar sensor surface itself, or on cover support areas.

Important Warnings for Owners

Owners should be aware that the conditions listed above can cause the FCW and ACC systems to be temporarily inhibited. The vehicle will alert the driver that these systems may be unavailable until the condition clears.

It is important to note that this communication, S2408000056, does not authorize warranty repairs. It serves as a record of past experiences and does not provide conclusions about vehicle issues. Technicians are responsible for determining the appropriate course of action.

Future Software Update

Updates designed to improve the sensitivity of the FCW and ACC systems are anticipated. These improvements are expected by the first quarter of 2025 with the release of new Brake System Software. This future update aims to enhance system performance and potentially reduce instances of the Alfa Romeo Stelvio FCW ACC warning.

Source: NHTSA ID: S2408000056